The other remaining files moved into other folders

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_LOADED no longer available. Instead use if TARGET.


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This MR changed all CMakeLists.txt files got support he standalone
build uder the new vtk module system.

All CMakeLists.txt files were changed to use the new and old vtk
module system,

A new Wiki macro was added, AddOptionalIfInLibrary.cmake. This macro
checks to see if an optional module is included in the VTK_LIBRARIES.

A new Wiki macro was added, WikiLoadMacros.cmake. This macro loads all of the example macros. With this, the includes could be removed frm the individual CMakeLists.txt file.


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Ancient versions of CMake required else(), endif(), and similar block
termination commands to have arguments matching the command starting the
block. This is no longer the preferred style.


Former-commit-id: 5e4adf25

Ancient CMake versions required upper-case commands. Later
command names became case-insensitive. Now the preferred style
is lower-case


Former-commit-id: 1c448fb9

This commit fixes the configuration and build of VTKWikiExamples as both a
VTK remote module and a stand-alone project. It ensure **first and follow-up
configurations** produce similar results and behave **identically**.

The build was broken following the introduction of
Kitware/VTK@e33b90d (ExternalModule: Improve target export to
allow build against external module).

The commit addresses the issue by introducing the WikiModuleConfig CMake
module responsible for:

* ensure module information are exported into `VTK_MODULES_DIR` by using
`vtk_module_export_info`.

* use `vtk_module_config` to ensure that variables like `VTK_LIBRARIES`
are set in the current scope when the project is build.


Former-commit-id: 766a0e16

The module has the "Legacy" prefix anticipating a module named
WikiModuleConfig will be added.


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Note that testing for VTK_BINARY_DIR or Module_WikiExamples are equivalent
since both evaluate to True when building the module from within VTK.


Former-commit-id: 1bee9a59

Report message are like the following:

```
-- VTKWikiExamples: Building VTKWikiExamples stand-alone
-- VTKWikiExamples: Building VTKWikiExamples stand-alone - yes
-- VTKWikiExamples: Setting executables prefix
-- VTKWikiExamples: Setting executables prefix - no
-- VTKWikiExamples: VTK VERSION: 8.1.0(OpenGL2)
[...]
```

or

```
[...]
-- VTKWikiExamples: Building VTKWikiExamples stand-alone
-- VTKWikiExamples: Building VTKWikiExamples stand-alone - no
-- VTKWikiExamples: Setting executables prefix
-- VTKWikiExamples: Setting executables prefix - yes [prefix: wiki]
[...]
```


Former-commit-id: 33514a73

The version now match the one used in VTK 8.1


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The test label is already set in ExampleTesting CMake module.


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